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Yamaha YZ250F 2008 Service Manual

Yamaha YZ250F 2008
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4-13
CARBURETOR
18. Install:
Carburetor breather hose "1"
Install the carburetor breather hoses
to the carburetor so that the hoses do
not bend near where they are in-
stalled.
ADJUSTING THE ACCELERATOR
PUMP TIMING
Adjustment steps:
In order for the throttle valve height
"a" to achieve the specified value,
tuck under the throttle valve plate "1"
the rod "2" etc. with the same outer di-
ameter as the specified value.
a. Fully turn in the accelerator pump
adjusting screw "3".
b. Check that the link lever "4" has
free play "b" by pushing lightly on
it.
c. Gradually turn out the adjusting
screw while moving the link lever
until it has no more free play.
INSTALLING THE CARBURETOR
1. Install:
Carburetor joint "1"
2. Install:
Carburetor "1"
Install the projection "a" between the
carburetor joint slots.
3. Install:
Hot starter plunger "1"
4. Tighten:
Bolt (carburetor joint) "1"
Bolt (air filter joint) "2"
5. Install:
Throttle cable (pull) "1"
Throttle cable (return) "2"
6. Adjust:
Throttle grip free play
Refer to "ADJUSTING THE
THROTTLE CABLE FREE PLAY"
section in the CHAPTER 3.
7. Install:
Throttle cable cover "1"
Bolt (throttle cable cover) "2"
8. Install:
Throttle position sensor lead cou-
pler "1"
•Clamp "2"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
Throttle valve height:
0.8 mm (0.031 in)
Carburetor joint:
10 Nm (1.0 m•kg, 7.2
ft•lb)
Hot starter plunger:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Bolt (carburetor joint):
3 Nm (0.3 m•kg, 2.2
ft•lb)
Bolt (air filter joint):
3 Nm (0.3 m•kg, 2.2
ft•lb)
Throttle cable (pull):
4 Nm (0.4 m•kg, 2.9
ft•lb)
Throttle cable (return):
11 Nm (1.1 m•kg, 8.0
ft•lb)
Bolt (throttle cable cov-
er):
4 Nm (0.4 m•kg, 2.9
ft•lb)

Table of Contents

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Yamaha YZ250F 2008 Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0 x 53.6mm
Compression Ratio13.5:1
IgnitionCDI
Transmission5-speed
Final DriveChain
Front Tire80/100-21
Rear Tire100/90-19
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryCarburetor
Front Suspension48mm inverted fork, fully adjustable
Rear Suspensionfully adjustable
Front BrakesSingle disc, 250mm
Rear BrakesHydraulic single disc

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